Was it on a listening test? I've found that those only allow the exact audio (like kona, sju, jenta)
I think the difference between Tjue and Sju is going to kill me. I just can't get it right.
Tjue (twenty) finish by en "open mouth" french "A" sounds like [chuA] Sju (seven) sounds like more [chu] without "A" at the end. I'm french, this is my only way of distinguish each other :)
We also have tyve and syv. That is really fun. Though where I'm from, we mostly use tjue and syv. Well, I do at least :P